1912-13.] Fuller Test of the Law of Torsional Oscillation. 181 
But we know from the form of our equation that our value of n must be 
given by the equation 
n+ 1 
This value of a then is not suitable. With a = 6, however, approximate 
agreement is obtained. 
With the relation n log y + log [log y -f k'(x 4- a)] = log b, plot [logy] 
against log [log y + k\x + a)], with [logy] as ordinate and log [log y + 7c' 
(cc + a)] as abscissa, using the values 
a = 6, h' = ’88, 
and taking the corresponding values of log y and (x + a) from the original 
curve for soft copper in its s-shape. Diagram II., curve B, shows the 
resulting curve, which is practically identical in form with curve A, the 
original logy against lo g(x-\-a) curve. It is still s-shaped, but shifted 
slightly further from the origin, and parallel to the old curve. The further 
